Question

what stretching frequencies (in cm⁻¹) are present in the structure below? none of these 2250 1715 all of these

Explanation:

Step1: Identify the functional groups

The structure is acetic - acid with a carbon - oxygen double bond (C=O) and an O - H bond.

Step2: Recall stretching frequencies

The C=O stretching frequency of a carboxylic acid is around 1710 - 1760 cm⁻¹. The O - H stretching frequency of a carboxylic acid is in the range of 2500 - 3300 cm⁻¹. The value 2250 cm⁻¹ is not characteristic of this structure. The C=O stretching frequency of this carboxylic acid is close to 1715 cm⁻¹.

Answer:

C. 1715